Taking Profits in a Position

I have doubled my money in (NDAQ). I am looking to sell half of my position and let the rest run. Some stocks I am looking at are ITG, AX, CME, LOGI, CUTR, MRGE, ISRG, or BBBB. I still need to do a little more research to make the best selection. I might buy two stocks from the above list. Since I have not done anything with the money from the sale of my shares in Halliburton (HAL).